Traveling heater

Fig. 1.14 The quasibinary phase diagram SnSe-ZnSe and the setup for the traveling heater method (THM). ZnSe single crystal grown by THM and using SnSe as solvent (top...

Figure 4.3 Schematic diagram of a thermal sweeper system located between two columns in the gas cliromatograph Cl, C2 and C3 are column connections, with C2 being small enough to allow the slotted heater S to pass over the connection. The accumulator column A retards the travel of solutes tlnough this section until the sweeper expels them out to the uncoated column (called a pigtail (P)), wliich then delivers them as a naixow band to the second column. The modulation drive, M, is external to the GC oven.

In the moving belt interface, effluent from the column is brought into contact with the belt, and the film of effluent is carried under an infra-red lamp evaporator which rapidly removes most of the solvent. The solute and residual solvent then pass through two vacuum locks, where remaining solvent is removed, and into the ion source of the mass spectrometer where the sample is flash vaporised. The belt then travels over a clean-up heater which removes any residual solute. 

Checking boiler and heater dampers for proper positioning and travel. 

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